EHEIM SubStratPro is pearl-shaped sintered glass biological media. Biological media helps aid in the most important task a filter can do. It creates a bacterial lawn which feeds on and transforms all kinds of dirt particles that are harmful to the aquarium. The main role of the biological media is to offer the best colonization conditions for the purification of bacteria and ensure stable conditions in the tank. Maintaining stable conditions is due to the bst possible surface structure.
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